Elaine M. Sadler, C. R. Jenkins et C. G. Kotanyi, « Low-luminosity radio sources in early-type galaxies », Monthly Notices of the Royal Astronomical Society, vol. 240, no 3, , p. 591-635 (Bibcode1989MNRAS.240..591S, lire en ligne [PDF])
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Elaine M. Sadler, C. R. Jenkins et C. G. Kotanyi, « Low-luminosity radio sources in early-type galaxies », Monthly Notices of the Royal Astronomical Society, vol. 240, no 3, , p. 591-635 (Bibcode1989MNRAS.240..591S, lire en ligne [PDF])